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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2d9c4a7de1cb29796607403103543f3773f44b0ecc04abb212ff21414d8602' 
  AND token = 'tYS1DL6GKQaJ0uKr1gIEE3phcpHCFGIPVq/rl8RJiaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}